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Science 20 September 1996:
Vol. 273. no. 5282, pp. 1690 - 1693
DOI: 10.1126/science.273.5282.1690
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Reports

Self-Assembly of a Two-Dimensional Superlattice of Molecularly Linked Metal Clusters

Ronald P. Andres, * Jeffery D. Bielefeld, Jason I. Henderson, David B. Janes, Venkat R. Kolagunta, Clifford P. Kubiak, William J. Mahoney, Richard G. Osifchin

Close-packed planar arrays of nanometer-diameter metal clusters that are covalently linked to each other by rigid, double-ended organic molecules have been self-assembled. Gold nanocrystals, each encapsulated by a monolayer of alkyl thiol molecules, were cast from a colloidal solution onto a flat substrate to form a close-packed cluster monolayer. Organic interconnects (aryl dithiols or aryl di-isonitriles) displaced the alkyl thiol molecules and covalently linked adjacent clusters in the monolayer to form a two-dimensional superlattice of metal quantum dots coupled by uniform tunnel junctions. Electrical conductance through such a superlattice of 3.7-nanometer-diameter gold clusters, deposited on a SiO2 substrate in the gap between two gold contacts and linked by an aryl di-isonitrile [1,4-di(4-isocyanophenylethynyl)-2-ethylbenzene], exhibited nonlinear Coulomb charging behavior.

R. P. Andres, J. D. Bielefeld, W. J. Mahoney, R. G. Osifchin, School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.
J. I. Henderson and C. P. Kubiak, Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA.
D. B. Janes and V. R. Kolagunta, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
*   To whom correspondence should be addressed.

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